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It may look intimidating, but it's got a very smooth feel and it fits comfortably in your hand. I started messing around with a design I based loosely on a spine and I came up with this. It fits perfectly around an IPhone 4 or 4s, but contact me if you'd like it for a different phone. But its a tight fit and all the ribs and spikes just barely touch the phone.
I'd really like to print this in alumide. That will probably be one of the next things I do and I'll post pics as soon as I do, but if anyone beats me to it please send pics :D